LD4771 12.7 mm Dia. UVFS Double-Concave Lens; EFL=-15mm Uncoated

The LD4771 is a spherical lens from Thorlabs, featuring a unique double-concave design with a diameter of 12.7 mm and a center thickness of 3 mm. This lens is specifically designed for use with a wavelength of 587.6 nm, making it suitable for a wide range of applications in the visible light spectrum.

The lens boasts an effective focal length (EFL) of -15 mm, which is a measure of the lens's ability to focus light. The negative value indicates that this is a diverging lens, meaning it spreads out light rays. This can be useful in applications where a wider beam of light is required.

The lens is made from UVFS, a material with the material ID "uvfs mal- 1965". This material is chosen for its specific optical properties, which make it suitable for use in a variety of optical systems.

Notably, the lens is uncoated. Coatings are often applied to lenses to improve their performance by reducing reflections, increasing transmission, or protecting the lens surface. However, an uncoated lens can be advantageous in certain situations, such as when broadband anti-reflection coatings are not required.

The lens's geometry is defined by its inner and outer radii, which are 0 in this case, and its two radii of curvature, R1 and R2. Here, R1 is -14.3 mm and R2 is 14.3 mm, indicating that the lens has a concave-convex shape.

According to the vendor's website, this lens is currently in stock, making it readily available for immediate use.